Electrode-holder for arc-lamps.



G. W. DAKE.

ELECTRODE HOLDER FOB. ARC LAMPS.

APPLICATION FILED DEC. 922.

pnrrnn e'rn rns ra rnn r enrich.

CHARLES W. 'DAKE, OF CHICAGO, ILLINOIS, ASSIGNOR T0 PYLE-NATIONAL ELECTRIC HEADLIGHT COMPANY, or cnxoaeo, ILLINOIS, A CORPORATION on NEW JERSEY.

To all whom it may concern:

Be it known that 1, GHAnLns W. DAKE, 'EL

citizen of the United States, residing Kat, Chicago, in the county of Cook and btate 7 1 -ane of Illinois, have invented a certain new and useful Improvement in Electrode-Holders for Arc-La1nps, of which the following is a specification.

.'My invention relates to electrode holders for are lamps and has particular reference to means for holding electrodes where it 1s necessary to keep the temperature of the electrode low.

My invention is illustrated in the accom panying drawing, wherein Figure 1 isa vertical section through the lower electrode, being made on the line 1-l of Fig. 2. Fig. 2 a view from above of the lower carbon and holder; Fig. 3 a cross section on the line 3-3 of Fig. 1; Fig. 4 a like cross section through a modification.

Like parts are indicated by the same letter in all the figures.

A is a standard suitably supported from the base of the lamp and provided with the upwardly projecting tubular part 1). This part is preferably enlarged at C and provided above and below this enlargement and on one side of the inner surface with the two notched ribs D, D. g

E is a wedge, shaped as shown, and havingat its lower end across pin F, the ends of which project respectively into the in clined. vertical channels (1}, G formed on the inside-of the separated parts J, J which project from the tubular portion B. The two parts J, J are connected below their upper extremities by tl-ieltransvcrsc part K, but a wide opening between them is left at J so' as to permit the wedge llto be lifted up, swung on its pin F in the upper part of the slots G, G and turned outwardly as indicated in the "dotted lines in Fig. 1 so as to release the carbon.-

E is a notch in the upper end of the wedge Ewhereby it can be pried upwardly when it is found to be stuck-or fastened in place.

L is the electrode which is adapted to be held by the holder. It comprises th 3 central core L .and the lateral longitudinal flanges or ribs L L These ribs are notched at their outer edges at L said notches being.

Speoificati n of Letters Patent.

Application filed December 5, 1912. Serial No. 735,033.

ELECTRODE-HOLDER FOR ARC-LAMPS.

Patented Dec 22, 1914.

preferably of equal length and adapted to register with the notches in the ribs D, I)

jon the inside of the tupular part.

Inthe modification shown in Fig. 4. M is I ectrode of the usual round form. In thisase the inner opening through the tubularpart B is eccentric as indicated at M and has no inner ribs. The electrode is not fluted or ribbed and there are no notches. The wedge-shaped locking device E is in this case slightly different inshape from that of the device shown in the other figures, otherwise the parts are essentially the same.

It will be understood, of course, that very considerable modifications can be made in the form, size, proportions and arrangement of these several features, and my drawings, therefore, are in a certain sense diagrammatic, although they register an actual structure. The are intended as diagrams to illustrate the idea of them as drawings of a fixed or settled form of the device.

The use and operation of my invention is as-follows: Assuming that the structure is to be employed in connection with an arc lamp intended for a locomotive headlight,

experience shows that it is highly desirable li loreover, as; the arc is from time to timeformed, the operation involves a dropping of the upper electrode on the lower and this tends to gradually drive the lower electrode down unless it be very rigidly held in position. If it be held rigidly in positio-n'by any ordinary clamping means, the heat tends to cause the parts to closely adhere so that it becomes very di'llicult to disengage them. This, however. is essential because the copper electrode-must be from time to time raised to accolninodate for the wear or consumption or disintegration of the upper end of such lower electgodfe. My invention is intended to take care of all these diliiculties.

The fluted electrode is the preferred form, and in this case the edges of the flutings are notched. The notches are equidistant, or of an equal length, so that if the lamp is trimmed a l; comparatively regular intervals,

it will only no neceesery to raise the electrode by one notch to preserve comparatively uni; form conditions. By having the opposed surfaces of the electrodes and ils holder notched, it will be nossihlelo secure the eleofirode rigidly-in position by clamping the opposed surl'eces togelher. l 'his is accomplishod by the sliding Wedge which .l. lune illustrated. it only necessz'uy to lift this wedge intoche position shown in dolled lincs until the electrode is out into position and then drop it heel; into place, whereupon it "forces the two opposed notched surfaces together. lf, hmrerer, the parts become stuck, the Wedge can be forced up by catching some tool in its upper notch and using the same as a lever to start it upwardly. The electrode if fluted presents, of course, a very ext-ended. radiating surface which tends to keep 'downlhe temperature, but to gel; the host effects its engagement with the Walls of lhe holder should be reduced to minimum and. this is accon'iplished in the preferred form of my device by raising; on the inner edge of the holder Nertical ribs with notches to register with those of lhe ribs on the electrode. If, however, for any reason this portion-of the invention is not important, the wedge device for locking the electrode in positionoen be employed as indicated in The Wedge may he introduced from below when the electrode is not in position.

I claim:

1. The combination with an are light electrode having fluted sides, of :r holder therefor having a plurality. of inwardly projecting ribs; to engage the ridges thereon and to form massages up therealong, the ridges and fills being serrated and interlooking with each. other, and means for holding; the electrode in fixed engagement with respect to the holder.

The combination with an are light electrode having; fluted sides of a holder herefor hail lug a plurality of imam-ally project ring ribs to engage the ridges thereon and to form. passages up thercnlong, the -ri l 2,es and ribs being serrated and interlocking: with each other, and means for holdingthe electrode in. fixed engagement with respect to the holder, said means comprising" a wedge slida'oly mounted in the holder oncl.

engaging one of the flutes formed in the electrode to force the serrations in the electo force the serrations in (he electrode and holder into engagement each with cheorhcr, guide slot in the holder, :1. pin located in the slot lhe small end of the Wedge odor-ted slide in the guide slot to be in well/ion timer in when the wedge is in the locking position.

l. The comliinalion with on are light cleo 'trode having fluted sides, of a holder therefor having a plural 5" of inwardly projecting ribs to engage r 1e ridges thereon. mill to form passages up thorealong, the ridges and ribs being serrated and interlo rhino; with. each ethos, and means for holding the electrode in fixed engagement with respect to the holder, said means couutu-zsing a wedge slidalsly mounted in the holder, the wedge. being slotted for manipulation at the end removed from the pin.

5. The combination with on. are light eleotrade having fluted sides, of a holder there for having plurality of inwardly projecting ribs to engage the ridges thereon and to form passages up thcrealoug, the ridges and ribs being serrgrted and iirtcrlockin}; with each other, and means for holding the clectrode in fixed engagement with respect in the holder said means; comprising a wedge slidablv inomited in the holder, the Wedge being slotted for manipulation at the end removed from the pin, the upper wider end of the wedge vmojeclping above.- the elli'ec'sire wedge engaging portion of the holder being slotted "for the introduction of a monipulao ing tool.

in testimony whereof, I allix my signalurc in the presence of two Witnesses this 3rd day of December 191.2. Y CHARLES \V. DARE.

. \Vitnecscs:

MINME M. LINDENAN, LAUREL M; Donmi'os 

